CN105790218B - Prevent the main transformer backup protection of tripping from pressing off lock system and method again - Google Patents
Prevent the main transformer backup protection of tripping from pressing off lock system and method again Download PDFInfo
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- CN105790218B CN105790218B CN201610259621.0A CN201610259621A CN105790218B CN 105790218 B CN105790218 B CN 105790218B CN 201610259621 A CN201610259621 A CN 201610259621A CN 105790218 B CN105790218 B CN 105790218B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 claims description 33
- 230000000052 comparative effect Effects 0.000 claims description 20
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of main transformer backup protection for preventing tripping to press off lock system and method again, it includes main transformer, further include high reserve protection, middle reserve protection and low reserve protection, the high side switch current transformer for obtaining high side switch electric current and the high voltage bus voltage transformer for obtaining high side bus voltage are connected on the high reserve protection, the medium voltage side switching current mutual inductor for obtaining medium voltage side switching current and the middle pressure bus-bar potential transformer for obtaining medium voltage side busbar voltage are connected on middle reserve protection, the low-side switch current transformer for obtaining low-side switch electric current and the low-voltage bus bar voltage transformer for obtaining low-pressure side bus voltage are connected on low-pressure side reserve protection；The present invention is compact-sized, can avoid voltage dip caused by shoving and improve the operation voltage of under-voltage protection, improves the sensitivity of lower voltage components under three-phase fault, securely and reliably.
Description
Technical field
The present invention relates to a kind of system and method, especially a kind of main transformer backup protection for preventing tripping presses off lock system again
And method, belong to the technical field of relay protection of power system.
Background technology
The often adjoint phenomenon of electric system failure is the increase of electric current and the reduction of voltage, and overcurrent protection is exactly logical
Electric current increased dramatically to realize when crossing the system failure.But since the starting of large scale equipment, machinery will also result in electric current
Moment increases, it is possible to causes the malfunction of switch, its malfunction, increases lower voltage components in protection in order to prevent, by PT voltages
It is introduced into protective device, forms low-voltage lockout overcurrent, only the two conditions are same in " increase of electric current and the reduction of voltage "
When just outlet tripping when meeting.By the back-up protection used time of overcurrent protection for transformer, a negative sequence voltage member is further added by
Part, as a barring condition, thus constitutes compound voltage lockout overcurrent, referred to as presses through stream again.
Pressure overcurrent protection again is used primarily in the back-up protection of transformer or the incoming relay-protection of transformer.Transformer overload
When, voltage can reduce, and electric current can raise naturally, it is possible to reach overcurrent definite value, and when situation about overloading can only occur very short
Between, if not having low-voltage lockout condition, transformer off-the-line can be caused, so in order to ensure the reliability of power supply, added low electricity
Press barring condition.
In the electric power system using composite voltage overcurrent protection, when medium voltage side busbar, the low-pressure side bus of main transformer
And during neighbouring device generation three phase short circuit fault, then it can only be opened through lower voltage components.If short-circuit impedance is larger, main transformer
Failure side bus voltage is higher than lower voltage components operation voltage, then the back-up protection of the failure side of main transformer is by tripping.Due to
The presence of main transformer impedance, two sub-value of high side bus voltage of main transformer will be above failure side bus voltage, therefore, main
The high side bus voltage of transformer is higher than lower voltage components operation voltage, after ultimately causing main transformer failure side and high-pressure side
Tripping occurs for standby protection, and failure can not be cut off, and seriously affect power grid and equipment safety.
The content of the invention
The purpose of the present invention is overcome the deficiencies in the prior art, there is provided a kind of main transformer backup protection for preventing tripping
Lock system and method are pressed off again, its is compact-sized, can avoid voltage dip caused by shoving and improve under-voltage protection
Operation voltage, improve three-phase fault under lower voltage components sensitivity, wide adaptation range, securely and reliably.
According to technical solution provided by the invention, the main transformer backup protection for preventing tripping presses off lock system again, including
Main transformer, the main transformer are connected by high side switch with high-voltage side bus, main transformer by medium voltage side switch with
Medium voltage side busbar connects, and main transformer is connected by low-side switch with low-pressure side bus；Further include and be configured at high-voltage side bus
The high reserve protection of side, the middle reserve protection for being configured at medium voltage side bus bar side and it is configured at low-pressure side bus side
Low reserve protection, is connected to obtain the high side switch electric current of high side switch electric current on the high reserve protection
Mutual inductor and the high voltage bus voltage transformer for obtaining high side bus voltage, are connected on middle reserve protection
Obtain the medium voltage side switching current mutual inductor of medium voltage side switching current and the middle pressure busbar for obtaining medium voltage side busbar voltage
Voltage transformer, is connected to obtain the low-side switch Current Mutual Inductance of low-side switch electric current on low-pressure side reserve protection
Device and the low-voltage bus bar voltage transformer for obtaining low-pressure side bus voltage；
It is connected with each other between the high reserve protection, middle reserve protection and low reserve protection, high standby
Protective device produces use according to high side switch electric current and high side bus voltage using composite voltage overcurrent protection mode
Overcurrent protection control signal is pressed again in the high pressure of the on off state of control high side switch, and is protected using high pressure inverse time lag low-voltage
Shield mode produces the high pressure inverse time-lag protection control signal of the on off state for controlling high side switch, high reserve protection
Overcurrent protection control signal or high pressure inverse time-lag protection control signal is pressed to control the switch of high side switch again according to high pressure；
Middle reserve protection utilizes composite voltage overcurrent according to medium voltage side switching current and medium voltage side busbar voltage
The middle pressure that protected mode produces the on off state for being used for controlling medium voltage side to switch presses overcurrent protection control signal again, and is pressed in utilizing
Inverse time lag under-voltage protection mode produces the middle pressure inverse time-lag protection control signal of the on off state for controlling medium voltage side to switch,
Middle reserve protection is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal control medium voltage side again
The switch of switch；
Low reserve protection utilizes composite voltage overcurrent according to low-side switch electric current and low-pressure side bus voltage
The low pressure that protected mode produces the on off state for being used to control low-side switch presses overcurrent protection control signal again, and utilizes low pressure
Inverse time lag under-voltage protection mode produces the low pressure inverse time-lag protection control signal of the on off state for controlling low-side switch,
Low reserve protection presses overcurrent protection control signal or low pressure inverse time-lag protection control signal to control low-pressure side again according to low pressure
The switch of switch.
The high reserve protection produces high pressure inverse time-lag protection by high pressure inverse time lag undervoltage protection and controls
Signal, the high pressure inverse time lag undervoltage protection include being used to receive high side bus voltage and high pressure negative sequence voltage criterion
Comparative result and the 3rd OR gate with high pressure inverse time lag low voltage criterion comparative result, the output terminal of the 3rd OR gate and
Eight are connected with the input terminal of door, and the 8th also receives high-pressure side with door presses overcurrent protection to put into status signal again, and the 8th is defeated with door
Outlet is connected with the input terminal of the 4th OR gate, and the input terminal of the 4th OR gate also receives medium voltage side and presses through stream protection act state letter again
Number, low-pressure side press through stream protection act status signal again, the output terminal of the 4th OR gate is connected with the tenth with an input terminal of door, the
Ten are also connected with another input terminal of door with the 9th with the output terminal of door, and the 9th is respectively used to receive failure electricity with the input terminal of door
Flow direction status signal and high side switch electric current and III sections of setting current value comparative results.
In the high pressure inverse time lag low voltage criterion, high pressure inverse time lag low-voltageFor
Wherein, UFXzdFor high pressure inverse time lag predeterminated voltage, UminFor minimum operation voltage, KFXFor safety factor, tFX1To be anti-
Time limit protects origination action time, tFX2For the most long actuation time of inverse time-lag protection.
A kind of main transformer backup protection for preventing tripping presses off locking method, including main transformer again, and the main transformer passes through
High side switch is connected with high-voltage side bus, and main transformer is switched by medium voltage side and is connected with medium voltage side busbar, and main transformer leads to
Low-side switch is crossed to be connected with low-pressure side bus；Further include and be configured at the high reserve protection of high-voltage side bus side, be configured at
The middle reserve protection of medium voltage side bus bar side and the low reserve protection for being configured at low-pressure side bus side, the high standby
It is connected to obtain the high side switch current transformer of high side switch electric current and for obtaining high-pressure side in protective device
The high voltage bus voltage transformer of busbar voltage, is connected to obtain the middle pressure of medium voltage side switching current on middle reserve protection
Side switching current mutual inductor and the middle pressure bus-bar potential transformer for obtaining medium voltage side busbar voltage, low-pressure side back-up protection
It is connected to obtain the low-side switch current transformer of low-side switch electric current and for obtaining low-pressure side bus on device
The low-voltage bus bar voltage transformer of voltage；
It is connected with each other between the high reserve protection, middle reserve protection and low reserve protection, high standby
Protective device produces use according to high side switch electric current and high side bus voltage using composite voltage overcurrent protection mode
Overcurrent protection control signal is pressed again in the high pressure of the on off state of control high side switch, and is protected using high pressure inverse time lag low-voltage
Shield mode produces the high pressure inverse time-lag protection control signal of the on off state for controlling high side switch, high reserve protection
Overcurrent protection control signal or high pressure inverse time-lag protection control signal is pressed to control the switch of high side switch again according to high pressure；
Middle reserve protection utilizes composite voltage overcurrent according to medium voltage side switching current and medium voltage side busbar voltage
The middle pressure that protected mode produces the on off state for being used for controlling medium voltage side to switch presses overcurrent protection control signal again, and is pressed in utilizing
Inverse time lag under-voltage protection mode produces the middle pressure inverse time-lag protection control signal of the on off state for controlling medium voltage side to switch,
Middle reserve protection is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal control medium voltage side again
The switch of switch；
Low reserve protection utilizes composite voltage overcurrent according to low-side switch electric current and low-pressure side bus voltage
The low pressure that protected mode produces the on off state for being used to control low-side switch presses overcurrent protection control signal again, and utilizes low pressure
Inverse time lag under-voltage protection mode produces the low pressure inverse time-lag protection control signal of the on off state for controlling low-side switch,
Low reserve protection presses overcurrent protection control signal or low pressure inverse time-lag protection control signal to control low-pressure side again according to low pressure
The switch of switch.
The high reserve protection produces high pressure inverse time-lag protection by high pressure inverse time lag undervoltage protection and controls
Signal, the high pressure inverse time lag undervoltage protection include being used to receive high side bus voltage and high pressure negative sequence voltage criterion
Comparative result and the 3rd OR gate with high pressure inverse time lag low voltage criterion comparative result, the output terminal of the 3rd OR gate and
Eight are connected with the input terminal of door, and the 8th also receives high-pressure side with door presses overcurrent protection to put into status signal again, and the 8th is defeated with door
Outlet is connected with the input terminal of the 4th OR gate, and the input terminal of the 4th OR gate also receives medium voltage side and presses through stream protection act state letter again
Number, low-pressure side press through stream protection act status signal again, the output terminal of the 4th OR gate is connected with the tenth with an input terminal of door, the
Ten are also connected with another input terminal of door with the 9th with the output terminal of door, and the 9th is respectively used to receive failure electricity with the input terminal of door
Flow direction status signal and high side switch electric current and III sections of setting current value comparative results.
In the high pressure inverse time lag low voltage criterion, high pressure inverse time lag low-voltageFor
Wherein, UFXzdFor high pressure inverse time lag predeterminated voltage, UminFor minimum operation voltage, KFXFor safety factor, tFX1To be anti-
Time limit protects origination action time, tFX2For the most long actuation time of inverse time-lag protection.
Advantages of the present invention：High reserve protection utilizes high pressure inverse time lag under-voltage protection mode to produce for controlling height
The high pressure inverse time-lag protection control signal of the on off state of side switch is pressed, high reserve protection presses overcurrent protection again according to high pressure
The switch of control signal or high pressure inverse time-lag protection control signal control high side switch；Middle reserve protection is pressed anti-in utilizing
Time under-voltage protection mode produces the middle pressure inverse time-lag protection control signal of the on off state for controlling medium voltage side to switch, in
Reserve protection is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal control medium voltage side to open again
The switch of pass；The low pressure that the on off state for controlling low-side switch is produced using low pressure inverse time lag under-voltage protection mode is anti-
Time limit protects control signal, and low reserve protection presses overcurrent protection control signal or low pressure inverse time-lag protection control according to low pressure again
The switch of signal control low-side switch processed, can avoid voltage dip caused by shoving and improve under-voltage protection
Operation voltage, improve three-phase fault under lower voltage components sensitivity, wide adaptation range, securely and reliably.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
Fig. 2 is the schematic diagram of inverse time lag low-voltage variation of the invention.
Fig. 3 is the circuit diagram of composite voltage overcurrent protection of the present invention.
Fig. 4 is the circuit diagram of inverse time lag low-voltage variation of the invention.
Description of reference numerals：1- main transformers, 2- differential protections, 3- non-electricity protecting devices, 4- high back-up protections
The low reserve protection of reserve protection, 6-, 7- high side switch current transformer, 8- high side switch, 9- in device, 5-
Busbar voltage mutual inductance is pressed in high voltage bus voltage transformer, 10- medium voltage sides switch, 11- medium voltage side switching currents mutual inductor, 12-
Device, 13- low-side switch, 14- low-side switch current transformer, 15- low-voltage bus bars voltage transformer, the first OR gates of 16-,
17- first and door, the second OR gates of 18-, 19- the 5th and door, the first timers of 20-, 21- the 6th and door, the second timers of 22-,
23- the 7th and door, the 3rd timers of 24-, 25- second and door, 26- the 3rd and door, 27- the 4th and door, the 3rd OR gates of 28-, 29-
8th with door, the 4th OR gates of 30-, 31- the 9th and door and 32- the tenth and door.
Embodiment
With reference to specific drawings and examples, the invention will be further described.
As shown in Figure 1：In order to avoid shove caused by voltage dip, and the operation voltage of low-voltage can be improved, carried
The sensitivity of lower voltage components under high three-phase fault, the present invention include main transformer 1, and the main transformer 1 is opened by high-pressure side
Close 8 to be connected with high-voltage side bus, main transformer 1 is connected by medium voltage side switch 10 with medium voltage side busbar, and main transformer 1 is by low
Pressure side switch 13 is connected with low-pressure side bus；In further including and be configured at the high reserve protection 4 of high-voltage side bus side, being configured at
The middle reserve protection 5 of pressure side bus side and the low reserve protection 6 for being configured at low-pressure side bus side, the high standby
It is connected to obtain the high side switch current transformer 7 of high side switch electric current and for obtaining high pressure in protective device 4
The high voltage bus voltage transformer 9 of side bus voltage, is connected on middle reserve protection 5 obtain medium voltage side switching current
Medium voltage side switching current mutual inductor 11 and the middle pressure bus-bar potential transformer 12 for obtaining medium voltage side busbar voltage, low-pressure side
It is connected to obtain the low-side switch current transformer 14 of low-side switch electric current and for obtaining on reserve protection 6
The low-voltage bus bar voltage transformer 15 of low-pressure side bus voltage；
It is connected with each other between the high reserve protection 4, middle reserve protection 5 and low reserve protection 6, Gao Hou
Standby protective device 4 is produced according to high side switch electric current and high side bus voltage using composite voltage overcurrent protection mode
The high pressure of on off state for controlling high side switch 8 presses overcurrent protection control signal again, and utilizes high pressure inverse time lag low electricity
Pressure protected mode produces the high pressure inverse time-lag protection control signal for the on off state for being used to control high side switch 8, and high standby is protected
Protection unit 4 presses overcurrent protection control signal or high pressure inverse time-lag protection control signal to control high side switch 8 again according to high pressure
Switch；
Middle reserve protection 5 utilizes composite voltage overcurrent according to medium voltage side switching current and medium voltage side busbar voltage
The middle pressure that protected mode produces the on off state for being used to control medium voltage side switch 10 presses overcurrent protection control signal again, and in utilization
Pressure inverse time lag under-voltage protection mode produces the middle pressure inverse time-lag protection control of the on off state for controlling medium voltage side switch 10
Signal, middle reserve protection 5 is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal control again
The switch of medium voltage side switch 10；
Low reserve protection 6 utilizes composite voltage overcurrent according to low-side switch electric current and low-pressure side bus voltage
The low pressure that protected mode produces the on off state for being used to control low-side switch 13 presses overcurrent protection control signal again, and utilizes low
Pressure inverse time lag under-voltage protection mode produces the low pressure inverse time-lag protection control of the on off state for controlling low-side switch 13
Signal, low reserve protection 6 press overcurrent protection control signal or low pressure inverse time-lag protection control signal to control again according to low pressure
The switch of low-side switch 13.
Specifically, main transformer 1 is usually also configured with differential protection 2 and non-electricity protecting device 3, the difference of configuration
The dynamic main protection of protective device 2 and non-ionizing energy loss 3 as main transformer 1, the main protection are used to quickly cut off main transformer pressure
All kinds of failures that the inside of device 1 and lead-out wire occur.The specific works mistake of differential protection 2 and non-electricity protecting device 3
Journey is known to those skilled in the art, and details are not described herein again.When main protection tripping, needed for the high process of reserve protection 4
Delay after cut off failure, ensure the safety of main transformer 1；Middle reserve protection 5, low reserve protection 6 can conducts
The back-up protection of medium voltage side busbar, low-pressure side bus and neighbouring device short trouble.
It is connected with each other between high reserve protection 4, middle reserve protection 5 and low reserve protection 6, high standby is protected
Protection unit 4 can press overcurrent protection input state letter again to middle reserve protection 5 and 6 transferring high voltage side of low reserve protection
Number, middle reserve protection 5 can transmit medium voltage side to high reserve protection 4 and low reserve protection 6 and press through stream guarantor again
Shield input status signal, low reserve protection 6 can transmit low pressure to high reserve protection 4 and middle reserve protection 5
Side presses through stream guard mode input signal again.
There is high pressure composite voltage overcurrent protection in high reserve protection 4, have in middle reserve protection 5
Middle pressure composite voltage overcurrent protection, low reserve protection 6 is interior to have low pressure composite voltage overcurrent protection；Its
In, high reserve protection 4 utilizes high pressure composite voltage overcurrent according to high side switch electric current and high side bus voltage
Protective device can use the common technological means of the art voltage overcurrent protection for composite, that is, obtain high pressure and press again
The detailed process of overcurrent protection control signal is known to those skilled in the art, and details are not described herein again.Similarly, middle back-up protection
During pressure composite voltage overcurrent protection obtains during device 5 is utilized according to medium voltage side switching current and medium voltage side busbar voltage
Pressure presses overcurrent protection control signal, low reserve protection 6 according to low-side switch electric current and low-pressure side bus voltage profit again
It is this technology to obtain low pressure to press the detailed process of overcurrent protection control signal again with low pressure composite voltage overcurrent protection
Known to the personnel of field, details are not described herein again.
When it is implemented, high reserve protection 4 is produced for controlling height using high pressure inverse time lag under-voltage protection mode
The high pressure inverse time-lag protection control signal of the on off state of side switch 8 is pressed, high reserve protection 4 presses through stream according to high pressure and protects again
Protect the switch of control signal or high pressure inverse time-lag protection control signal control high side switch 8；During middle reserve protection 5 utilizes
Pressure inverse time lag under-voltage protection mode produces the middle pressure inverse time-lag protection control of the on off state for controlling medium voltage side switch 10
Signal, middle reserve protection 5 is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal control again
The switch of medium voltage side switch 10；The switch for controlling low-side switch 13 is produced using low pressure inverse time lag under-voltage protection mode
The low pressure inverse time-lag protection control signal of state, low reserve protection 6 press overcurrent protection control signal or low according to low pressure again
Press the switch of inverse time-lag protection control signal control low-side switch 13.
In the embodiment of the present invention, it is anti-that high reserve protection 4 using high pressure inverse time lag under-voltage protection mode produces high pressure
Time limit protects control signal, and the on off state of high side switch 8 is pressed overcurrent protection control signal or high pressure inverse time lag by high pressure again
Protection control signal is controlled, so that under supply network malfunction, can realize and the effective of high side switch 8 is disconnected,
Ensure the safety of supply network and electrical equipment etc..The high pressure inverse time lag under-voltage protection is obtained according to trouble duration
Voltage is protected to required high pressure minimum living, using the relation between high side bus voltage and high pressure minimum living family voltage, so as to produce
High pressure inverse time-lag protection control signal, voltage dip caused by so as to avoid all kinds of shove, and low-voltage guarantor can be improved
The operation voltage of shield, improves the sensitivity of lower voltage components under three-phase fault；The operation voltage of the under-voltage protection refers to low
When the operation voltage of the under-voltage protection, low pressure inverse time-lag protection control signal can be produced.The middle profit of reserve protection 5
Inverse time-lag protection control signal, low reserve protection 6 is pressed to utilize low pressure in being produced with middle pressure inverse time lag under-voltage protection mode
The detailed process that inverse time lag under-voltage protection mode produces low pressure inverse time-lag protection control signal is produced with high reserve protection 4
The process of raw high pressure inverse time-lag protection control signal is similar, and details are not described herein again.
As shown in figure 3, be the schematic diagram of composite voltage overcurrent protection, including the first OR gate 16 and with first or
Door 16 output terminals connection first with door 17, first is connected with the output terminal of door 17 with the first OR gate 18, the first OR gate 18 it is defeated
Outlet connects with the 5th and an input terminal of door 19, the 6th with an input terminal of door 21 and the 7th with an input terminal of door 23 respectively
Connect, the 5th is connected with another input terminal of door 19 with second with the output terminal of door 25, the 6th with another input terminal of door 21 and the
Three are connected with the output terminal of door 26, and the 7th is connected with another input terminal of door 23 with the 4th with the output terminal of door 27, and the 5th and door
19 output terminal is connected with the input terminal of the first timer 20, the 6th with the output terminal of door 21 and the input terminal of the second timer 22
Connection, the 7th is connected with the output terminal of door 23 with the input terminal of the 3rd timer 24.
Illustrated by taking high pressure composite voltage overcurrent protection as an example, specifically, an input terminal of the first OR gate 16
High voltage bus side voltage and high pressure negative sequence voltage criterion comparative result are received, another input terminal of the first OR gate 16 receives high pressure mother
Line side voltage and the comparative result of high pressure low voltage criterion, the first OR gate 16 export corresponding logic electricity according to above-mentioned comparative result
It is flat, wherein, high pressure negative sequence voltage criterion, the specific size of high pressure low voltage criterion can be set as needed, specifically be set
Fixed process is known to those skilled in the art.First also receives high-pressure side with the input terminal of door 17 presses through stream operating state again
Signal, when it is true (or high level) that high-pressure side presses through stream protection act status signal again, represent high pressure reserve protection 4 into
Row presses off lock function again, otherwise, only carries out overcurrent protection function；The input terminal of second OR gate 18 also receives medium voltage side and presses through stream again
Protection act status signal and low-pressure side press through stream protection act status signal again, and medium voltage side presses through stream protection act state again
Signal, low-pressure side press through stream protection act status signal and may be referred to high-pressure side and press through stream protection act status signal again to say again
It is bright.
Second receives fault current direction status signal with an input terminal of door 25, and second with another input terminal of door 25
For receiving high side switch electric current and I sections of setting current value comparative results, fault current direction status signal is to adjust pros
Xiang Shi, then second receive high level or significant level signal with the input terminal of door 25；Protected when to adjust positive direction superficial failure
Protect on the direction chosen, cutoff high side switch 8 can be carried out at this time.3rd receives fault current side with door 26 with input terminal
To status signal, and the 3rd is used to receive high side switch electric current compared with II sections of setting current values with another input terminal of door 26
As a result；4th receives fault current direction status signal with an input terminal of door 27, and the 4th uses with another input terminal of door 27
In receiving go pressure side switching current and III sections of setting current value comparative results, I sections of setting current values, II sections of setting current values with
It is specially this technology neck and specific choose of III sections of setting current values can be determined according to situations such as actual power occasion
Known to the personnel of domain, details are not described herein again.First timer 20, the second timer 22, set respectively in the 3rd timer 24 it is multiple
I sections of time setting values of overcurrent protection are pressed, II sections of time value setting valves of overcurrent protection is pressed again, presses the III times of overcurrent protection whole again
Definite value, the size of corresponding time setting value can be determined according to situations such as actual power occasion, be specially the art
Known to personnel, details are not described herein again.
When it is implemented, the concrete structure of high pressure composite voltage overcurrent protection and middle pressure composite voltage over current protection
Protection unit, the corresponding concrete structure of low pressure composite voltage overcurrent protection are identical, and negative phase-sequence electricity is pressed according to power supply occasion centering
Pressure criterion, in force down the Protection parameters such as voltage criterion, low pressure negative sequence voltage criterion and low pressure low voltage criterion and modify i.e.
Can, it is specially that details are not described herein again known to those skilled in the art.
As shown in figure 4, the high reserve protection 4 produces high pressure inverse time by high pressure inverse time lag undervoltage protection
Limit protection control signal, the high pressure inverse time lag undervoltage protection include bearing with high pressure for receiving high side bus voltage
Sequence voltage criterion comparative result and the 3rd OR gate 28 with high pressure inverse time lag low voltage criterion comparative result, the 3rd OR gate
28 output terminal is connected with the 8th with the input terminal of door 29, and the 8th also receives high-pressure side with door 29 presses overcurrent protection to put into state again
Signal, the 8th is connected with the output terminal of door 29 with the input terminal of the 4th OR gate 30, and the input terminal of the 4th OR gate 30 is pressed in also receiving
Side presses through stream protection act status signal again, low-pressure side presses through stream protection act status signal, the output terminal of the 4th OR gate 30 again
It is connected with the tenth with an input terminal of door 32, the tenth is also connected with another input terminal of door 32 with the 9th with the output terminal of door 31,
9th is respectively used to receive fault current direction status signal and high side switch electric current and III sections whole with the input terminal of door 31
Constant current value comparative result.
In the embodiment of the present invention, high pressure negative sequence voltage criterion can be used and filled with above-mentioned high pressure composite voltage overcurrent protection
Put identical value.In the high pressure inverse time lag low voltage criterion, high pressure inverse time lag low-voltageFor
Wherein, UFXzdFor high pressure inverse time lag predeterminated voltage, UminFor minimum operation voltage, KFXFor safety factor, tFX1To be anti-
Time limit protects origination action time, tFX2For the most long actuation time of inverse time-lag protection.
The characteristic of high pressure inverse time lag low-voltage is as shown in Fig. 2, as seen from the figure, the high pressure inverse time lag maximum of low voltage criterion is moved
Make voltage as time change gradually rises, anti-time limit characteristic is presented.tFX1When pressing overcurrent protection origination action again for the inverse time lag
Between, its setting valve should avoid voltage dip caused by all kinds of shove, can be with pressing off lock overcurrent in high pressure reserve protection 4 again most
End operating time of protection is consistent；UFXzdFor tFX1The maximum actuation voltage at moment, allows generation high pressure anti-less than this voltage
Time limit protects control signal.Time definite value tFX2Press overcurrent protection most long actuation time again for the inverse time lag, can be according to primary equipment
Maximum failure tolerance time value, the maximum actuation voltage U at this momentFXFor：
UFX=KFXUmin
K in formulaFXFor safety factor, 0.9~0.95, U can actually be taken according to sceneminFor system minimum operation voltage.
When it is implemented, middle pressure inverse time lag undervoltage protection, low reserve protection in middle reserve protection 5
The logical construction of low pressure inverse time lag undervoltage protection in 6 is identical with high pressure inverse time lag undervoltage protection, only
Require to change above-mentioned corresponding arrange parameter according to actual power occasion and protection, specifically repeat no more.
To sum up, obtaining the present invention prevents the main transformer backup protection of tripping from pressing off locking method again, is specially：Including main transformer
1, the main transformer 1 is connected by high side switch 8 with high-voltage side bus, and main transformer 1 is by medium voltage side switch 10 with
Side bus connection is pressed, main transformer 1 is connected by low-side switch 13 with low-pressure side bus；Further include and be configured at high-voltage side bus
The high reserve protection 4 of side, the middle reserve protection 5 for being configured at medium voltage side bus bar side and it is configured at low-pressure side bus side
Low reserve protection 6, be connected to obtain the high side switch of high side switch electric current on the high reserve protection 4
Current transformer 7 and the high voltage bus voltage transformer 9 for obtaining high side bus voltage, on middle reserve protection 5
It is connected to obtain the medium voltage side switching current mutual inductor 11 of medium voltage side switching current and for obtaining medium voltage side busbar voltage
Middle pressure bus-bar potential transformer 12, be connected to obtain the low pressure of low-side switch electric current on low-pressure side reserve protection 6
Side switching current mutual inductor 14 and the low-voltage bus bar voltage transformer 15 for obtaining low-pressure side bus voltage；
It is connected with each other between the high reserve protection 4, middle reserve protection 5 and low reserve protection 6, Gao Hou
Standby protective device 4 is produced according to high side switch electric current and high side bus voltage using composite voltage overcurrent protection mode
The high pressure of on off state for controlling high side switch 8 presses overcurrent protection control signal again, and utilizes high pressure inverse time lag low electricity
Pressure protected mode produces the high pressure inverse time-lag protection control signal for the on off state for being used to control high side switch 8, and high standby is protected
Protection unit 4 presses overcurrent protection control signal or high pressure inverse time-lag protection control signal to control high side switch 8 again according to high pressure
Switch；
Middle reserve protection 5 utilizes composite voltage overcurrent according to medium voltage side switching current and medium voltage side busbar voltage
The middle pressure that protected mode produces the on off state for being used to control medium voltage side switch 10 presses overcurrent protection control signal again, and in utilization
Pressure inverse time lag under-voltage protection mode produces the middle pressure inverse time-lag protection control of the on off state for controlling medium voltage side switch 10
Signal, middle reserve protection 5 is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal control again
The switch of medium voltage side switch 10；
Low reserve protection 6 utilizes composite voltage overcurrent according to low-side switch electric current and low-pressure side bus voltage
The low pressure that protected mode produces the on off state for being used to control low-side switch 13 presses overcurrent protection control signal again, and utilizes low
Pressure inverse time lag under-voltage protection mode produces the low pressure inverse time-lag protection control of the on off state for controlling low-side switch 13
Signal, low reserve protection 6 press overcurrent protection control signal or low pressure inverse time-lag protection control signal to control again according to low pressure
The switch of low-side switch 13.
The high reserve protection 4 of the present invention is produced for controlling high-pressure side to open using high pressure inverse time lag under-voltage protection mode
The high pressure inverse time-lag protection control signal of 8 on off state is closed, high reserve protection 4 presses overcurrent protection to control again according to high pressure
The switch of signal or high pressure inverse time-lag protection control signal control high side switch 8；Middle reserve protection 5 presses inverse time in utilizing
Limit under-voltage protection mode produces the middle pressure inverse time-lag protection control signal of the on off state for controlling medium voltage side switch 10, in
Reserve protection 5 is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal control medium voltage side to open again
Close 10 switch；The low of the on off state for controlling low-side switch 13 is produced using low pressure inverse time lag under-voltage protection mode
Inverse time-lag protection control signal is pressed, low reserve protection 6 presses overcurrent protection control signal or low pressure inverse time lag according to low pressure again
The switch of control signal control low-side switch 13 is protected, voltage dip caused by shoving can be avoided and improve low electricity
Press protection operation voltage, improve three-phase fault under lower voltage components sensitivity, wide adaptation range, securely and reliably.
Claims (6)
1. a kind of main transformer backup protection for preventing tripping presses off lock system, including main transformer (1), the main transformer (1) again
It is connected by high side switch (8) with high-voltage side bus, main transformer (1) switchs (10) by medium voltage side and connects with medium voltage side busbar
Connect, main transformer (1) is connected by low-side switch (13) with low-pressure side bus；It is characterized in that：Further include and be configured at high-pressure side
The high reserve protection (4) of bus bar side, the middle reserve protection (5) for being configured at medium voltage side bus bar side and it is configured at low pressure
The low reserve protection (6) of side bus side, is connected on the high reserve protection (4) obtain high side switch electric current
High side switch current transformer (7) and high voltage bus voltage transformer (9) for obtaining high side bus voltage, in
It is connected to obtain the medium voltage side switching current mutual inductor (11) of medium voltage side switching current on reserve protection (5) and is used for
The middle pressure bus-bar potential transformer (12) of medium voltage side busbar voltage is obtained, low-pressure side reserve protection is connected to obtain on (6)
Take low-side switch current transformer (14) and the low pressure for obtaining low-pressure side bus voltage of low-side switch electric current female
Line voltage mutual inductor (15)；
It is connected with each other between the high reserve protection (4), middle reserve protection (5) and low reserve protection (6), it is high
Reserve protection (4) utilizes composite voltage overcurrent protection mode according to high side switch electric current and high side bus voltage
The high pressure for producing the on off state for being used to control high side switch (8) presses overcurrent protection control signal again, and utilizes high pressure inverse time
Limit under-voltage protection mode produces the high pressure inverse time-lag protection control signal of the on off state for controlling high side switch (8),
High reserve protection (4) presses overcurrent protection control signal or high pressure inverse time-lag protection control signal to control high pressure again according to high pressure
The switch of side switch (8)；
Middle reserve protection (5) utilizes composite voltage over current protection according to medium voltage side switching current and medium voltage side busbar voltage
Shield mode is produced for controlling the middle pressure of the on off state of medium voltage side switch (10) to press overcurrent protection control signal again, and in utilization
Pressure inverse time lag under-voltage protection mode produces the middle pressure inverse time-lag protection control of the on off state for controlling medium voltage side switch (10)
Signal processed, middle reserve protection (5) is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal again
Control the switch of medium voltage side switch (10)；
Low reserve protection (6) utilizes composite voltage over current protection according to low-side switch electric current and low-pressure side bus voltage
Shield mode is produced for controlling the low pressure of the on off state of low-side switch (13) to press overcurrent protection control signal again, and is utilized low
Pressure inverse time lag under-voltage protection mode produces the low pressure inverse time-lag protection control of the on off state for controlling low-side switch (13)
Signal processed, low reserve protection (6) press overcurrent protection control signal or low pressure inverse time-lag protection control signal according to low pressure again
Control the switch of low-side switch (13).
2. the main transformer backup protection according to claim 1 for preventing tripping presses off lock system again, it is characterized in that：After the height
Standby protective device (4) produces high pressure inverse time-lag protection control signal, the high pressure by high pressure inverse time lag undervoltage protection
Inverse time lag undervoltage protection include being used for receiving high side bus voltage and high pressure negative sequence voltage criterion comparative result and
With the 3rd OR gate (28) of high pressure inverse time lag low voltage criterion comparative result, the output terminal of the 3rd OR gate (28) and the 8th with
The input terminal connection of door (29), the 8th also receives high-pressure side with door (29) presses overcurrent protection input status signal again, and the 8th and door
(29) output terminal is connected with the input terminal of the 4th OR gate (30), and the input terminal of the 4th OR gate (30) also receives medium voltage side and presses through again
Stream protection act status signal, low-pressure side press through stream protection act status signal, the output terminal and the tenth of the 4th OR gate (30) again
It is connected with an input terminal of door (32), the tenth is also connected with another input terminal of door (32) with the 9th with the output terminal of door (31),
9th is respectively used to receive fault current direction status signal and high side switch electric current and III sections with the input terminal of door (31)
Setting current value comparative result.
3. the main transformer backup protection according to claim 2 for preventing tripping presses off lock system again, it is characterized in that：The high pressure
In inverse time lag low voltage criterion, high pressure inverse time lag low-voltageFor
Wherein, UFXzdFor high pressure inverse time lag predeterminated voltage, UminFor minimum operation voltage, KFXFor safety factor, tFX1For the inverse time lag
Protect origination action time, tFX2For the most long actuation time of inverse time-lag protection.
4. a kind of main transformer backup protection for preventing tripping presses off locking method, including main transformer (1), the main transformer (1) again
It is connected by high side switch (8) with high-voltage side bus, main transformer (1) switchs (10) by medium voltage side and connects with medium voltage side busbar
Connect, main transformer (1) is connected by low-side switch (13) with low-pressure side bus；It is characterized in that：Further include and be configured at high-pressure side
The high reserve protection (4) of bus bar side, the middle reserve protection (5) for being configured at medium voltage side bus bar side and it is configured at low pressure
The low reserve protection (6) of side bus side, is connected on the high reserve protection (4) obtain high side switch electric current
High side switch current transformer (7) and high voltage bus voltage transformer (9) for obtaining high side bus voltage, in
It is connected to obtain the medium voltage side switching current mutual inductor (11) of medium voltage side switching current on reserve protection (5) and is used for
The middle pressure bus-bar potential transformer (12) of medium voltage side busbar voltage is obtained, low-pressure side reserve protection is connected to obtain on (6)
Take low-side switch current transformer (14) and the low pressure for obtaining low-pressure side bus voltage of low-side switch electric current female
Line voltage mutual inductor (15)；
It is connected with each other between the high reserve protection (4), middle reserve protection (5) and low reserve protection (6), it is high
Reserve protection (4) utilizes composite voltage overcurrent protection mode according to high side switch electric current and high side bus voltage
The high pressure for producing the on off state for being used to control high side switch (8) presses overcurrent protection control signal again, and utilizes high pressure inverse time
Limit under-voltage protection mode produces the high pressure inverse time-lag protection control signal of the on off state for controlling high side switch (8),
High reserve protection (4) presses overcurrent protection control signal or high pressure inverse time-lag protection control signal to control high pressure again according to high pressure
The switch of side switch (8)；
Middle reserve protection (5) utilizes composite voltage over current protection according to medium voltage side switching current and medium voltage side busbar voltage
Shield mode is produced for controlling the middle pressure of the on off state of medium voltage side switch (10) to press overcurrent protection control signal again, and in utilization
Pressure inverse time lag under-voltage protection mode produces the middle pressure inverse time-lag protection control of the on off state for controlling medium voltage side switch (10)
Signal processed, middle reserve protection (5) is pressed in presses overcurrent protection control signal or middle pressure inverse time-lag protection control signal again
Control the switch of medium voltage side switch (10)；
Low reserve protection (6) utilizes composite voltage over current protection according to low-side switch electric current and low-pressure side bus voltage
Shield mode is produced for controlling the low pressure of the on off state of low-side switch (13) to press overcurrent protection control signal again, and is utilized low
Pressure inverse time lag under-voltage protection mode produces the low pressure inverse time-lag protection control of the on off state for controlling low-side switch (13)
Signal processed, low reserve protection (6) press overcurrent protection control signal or low pressure inverse time-lag protection control signal according to low pressure again
Control the switch of low-side switch (13).
5. prevent the main transformer backup protection of tripping from pressing off locking method again according to claim 4, it is characterized in that：The high standby
Protective device (4) produces high pressure inverse time-lag protection control signal by high pressure inverse time lag undervoltage protection, and the high pressure is anti-
Time-undervoltage protection include being used for receiving high side bus voltage and high pressure negative sequence voltage criterion comparative result and with
3rd OR gate (28) of high pressure inverse time lag low voltage criterion comparative result, the output terminal and the 8th and door of the 3rd OR gate (28)
(29) input terminal connection, the 8th also receives high-pressure side with door (29) presses overcurrent protection input status signal again, and the 8th and door
(29) output terminal is connected with the input terminal of the 4th OR gate (30), and the input terminal of the 4th OR gate (30) also receives medium voltage side and presses through again
Stream protection act status signal, low-pressure side press through stream protection act status signal, the output terminal and the tenth of the 4th OR gate (30) again
It is connected with an input terminal of door (32), the tenth is also connected with another input terminal of door (32) with the 9th with the output terminal of door (31),
9th is respectively used to receive fault current direction status signal and high side switch electric current and III sections with the input terminal of door (31)
Setting current value comparative result.
6. prevent the main transformer backup protection of tripping from pressing off locking method again according to claim 5, it is characterized in that：The high pressure is anti-
In time-undervoltage criterion, high pressure inverse time lag low-voltageFor
Wherein, UFXzdFor high pressure inverse time lag predeterminated voltage, UminFor minimum operation voltage, KFXFor safety factor, tFX1For the inverse time lag
Protect origination action time, tFX2For the most long actuation time of inverse time-lag protection.
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| CN107611930A (en) * | 2017-10-17 | 2018-01-19 | 山东钢铁股份有限公司 | A kind of high voltage protective system |
| CN109031179B (en) * | 2018-07-04 | 2020-11-24 | 云南电网有限责任公司 | Main transformer CT polarity and protection direction self-adaptive checking method |
| CN111342429A (en) * | 2020-04-22 | 2020-06-26 | 郑州润杰电力勘测设计有限公司 | Main transformer equipment protection system |
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| JP2007244138A (en) * | 2006-03-10 | 2007-09-20 | Chugoku Electric Power Co Inc:The | Protective circuit |
| CN203965826U (en) * | 2014-06-30 | 2014-11-26 | 国网上海市电力公司 | A kind of composite voltage locking directional over-current protection simulator of controllable phase shifter |
| CN204349424U (en) * | 2014-11-22 | 2015-05-20 | 国网辽宁省电力有限公司锦州供电公司 | Microcomputer transformer backup protection loop |
| CN105375437B (en) * | 2015-12-18 | 2019-01-25 | 江苏省电力公司宿迁供电公司 | The low reserve protection of main transformer with Sudden Changing Rate starting |
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